What, If Anything, Is the Difference Between Euthanasia and Physician-Assisted

What, if anything, is the difference between euthanasia and physician-assisted suicide?

A) In euthanasia, a doctor administers lethal drugs. In physician-assisted suicide, the patient administers their own lethal drugs.
B) Euthanasia applies to animals; physician-assisted suicide applies to humans.
C) In physician-assisted suicide, a doctor administers lethal drugs. In euthanasia, the patient administers their own lethal drugs.
D) There is no difference between the two.